Term monopolistic competition long-run equilibrium Definition: Relative freedom of entry and exit ensures that, in the long run, every firm in a monopolistically competitive industry earns exactly a normal profit, receiving neither an economic profit, nor incurring an economic loss. This result is achieved because entry and exit affects the market supply curve, which affects the overall market price, each firm's demand curve, and the range or prices it can charge. Each firm's demand curve adjusts until the profit-maximizing price is exactly equal to average total cost (both short run and long run).